常用音频格式对应的采样率，每采样点bit数以及比特率

Format SamplesPerSec BitsPerSample BitsPerSec
（格式） (采样频率) (每采样点bit数) (比特率或位率)
MEDIA_FORMAT_WAV 8kHz 16 bits / sample 128 kbps
MEDIA_FORMAT_PCM_8K 8kHz 16 bits / sample 128 kbps
MEDIA_FORMAT_WAV_16K 16kHz 16 bits / sample 256 kbps
MEDIA_FORMAT_PCM_16K 16kHz 16 bits / sample 256 kbps
MEDIA_FORMAT_WAV_ALAW 8kHz 8 bits / sample 64 kbps
MEDIA_FORMAT_WAV_ULAW 8kHz 8 bits / sample 64 kbps
MEDIA_FORMAT_WAV_DVI_ADPCM 8kHz 4 bits / sample 32 kbps
MEDIA_FORMAT_WAV_DVI_ADPCM_16K 16kHz 4 bits / sample 64 kbps